"In Equals, things go wrong because you can't deny the humanity in everyone.It's the most devastating story."

Written by Nathan Parker (Moon), Equals is the first feature film by Drake Doremus that he didn't write himself.

"I trust Drake's process and I know we will do something really natural and real," said Stewart. "But I told Drake, 'Don't expect that I am going to be able to do this. It's too hard.' But he wouldn't take 'no' for an answer. I've given directors disclaimers before, but never this much."

Nicholas Hoult Will Star Alongside Stewart

Doremus has revealed that Jennifer Lawrence - who is reported to be in a relationship with Hoult - also read Parker's script.

"Jen and I worked together before and she was fantastic," said the director. "It's exciting to talk about the character with different people, but it became evident in my head that Nick and Kristen would have great chemistry."

Jennifer Lawrence heads to Sundance Film Festival in Utah this week for the premiere of Peter Sattler's soldier movie Camp X-Ray.

Hoult recently completed filming on the Australian post-apocalyptic movie Mad Max, Fury Road which is directed, produced and co-written by George Miller. The film stars Tom Hardy as Mad Max and is set for release in May, 2015.